Question

I’ve made a helper

public static class UrlHelperExtension
{
    public static string GetContent(this UrlHelper url, string link, bool breakCache = true)
    {
        // stuff
    }
}

How do I test it in a unit test?

[TestClass]
public class HelperTestSet
{
    [TestMethod]
    public void GetContentUrl()
    {
        // What do I need to do here?
        // I need a RequestContext to create a new UrlHelper
        // Which is the simplest way to test it?
    }
}

How do I create the helper needed for the test?

Answer 1

From this website I came up with

namespace Website.Tests
{
    public static class UrlHelperExtender
    {
        public static string Get(this UrlHelper url)
        {
            return "a";
        }
    }

    [TestClass]
    public class All
    {
        private class FakeHttpContext : HttpContextBase
        {
            private Dictionary<object, object> _items = new Dictionary<object, object>();
            public override IDictionary Items { get { return _items; } }
        }

        private class FakeViewDataContainer : IViewDataContainer
        {
            private ViewDataDictionary _viewData = new ViewDataDictionary();
            public ViewDataDictionary ViewData { get { return _viewData; } set { _viewData = value; } }
        }

        [TestMethod]
        public void Extension()
        {
            var vc = new ViewContext();
            vc.HttpContext = new FakeHttpContext();
            vc.HttpContext.Items.Add("wtf", "foo");

            var html = new HtmlHelper(vc, new FakeViewDataContainer());
            var url = new UrlHelper(vc.RequestContext);

            var xx = url.Get();

            Assert.AreEqual("a", xx);
        }
    }
}